<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>事件循环_练习</title>
  </head>

  <body>
    <script>
      /**
       * 目标：阅读并回答执行的顺序结果
       */
      console.log(1);
      setTimeout(() => {
        console.log(2);
      }, 2000);
      function myFn() {
        console.log(3);
      }
      function ajaxFn() {
        const xhr = new XMLHttpRequest();
        xhr.open("GET", "http://hmajax.itheima.net/api/province");
        xhr.addEventListener("loadend", () => {
          console.log(4);
        });
        xhr.send();
      }
      for (let i = 0; i < 1; i++) {
        console.log(5);
      }
      ajaxFn();

      setTimeout(() => {
        console.log(7);
      }, 1000);
      document.addEventListener("click", () => {
        console.log(6);
      });
      myFn();
      // 1 5 3 4 7 2 点击一次document就会执行一次打印6
    </script>
  </body>
</html>
